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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Sony TV vertical interlace problem...
I have seen this problem in many older sony sets, around 1992-1993, using
the chassis with the 3 stand-up cards (this set chassis also has the imfamous Sony sound module that goes bad too) This particular model is a KV32TS20, but again, many models use these modules... The problem:the vertical sweep is perfectly stable, but the 2 fields do not 'lace' properly; the interlacing acts 'loose' sometimes being aligned at the top or middle, almost never the bottom. Ajusting the height or the lin will make different areas be 'lined up' something changes between them so they don't register properly...everything is vertically jumpy, depending on screen position...this sets uses the TDA8302 ic chip for vertical generation... Swapping different cards can move the problem around, but not fix it... has anyone ran into this? I figure a cap is at fault, and have checked the obvious ones, to no avail... help ? Viper |
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Sony TV vertical interlace problem...
"Vector Viper" wrote in message ... I have seen this problem in many older sony sets, around 1992-1993, using the chassis with the 3 stand-up cards (this set chassis also has the imfamous Sony sound module that goes bad too) This particular model is a KV32TS20, but again, many models use these modules... The problem:the vertical sweep is perfectly stable, but the 2 fields do not 'lace' properly; the interlacing acts 'loose' sometimes being aligned at the top or middle, almost never the bottom. Ajusting the height or the lin will make different areas be 'lined up' something changes between them so they don't register properly...everything is vertically jumpy, depending on screen position...this sets uses the TDA8302 ic chip for vertical generation... Swapping different cards can move the problem around, but not fix it... has anyone ran into this? I figure a cap is at fault, and have checked the obvious ones, to no avail... help ? To add to this-I have 2 "A" cards, 1 has great interlace, one does not (top about 2 lines out) Yet I can see no difference in the vertical output signal or other waveforms. It's ON the A card!!! (Somehow) It's not the TDA8302 ic, I took one off a bad board; the board still has great lace right now, as before... Argh! It's JUST bad enough to be annoying on a 30"sony set, so the problem can't be ignored- argh!!!!!! ARGH!!!!!!!!! Viper Viper |
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